20720502162111 has 16 divisors (see below), whose sum is σ = 27645483938688. Its totient is φ = 13804597029600.

The previous prime is 20720502162079. The next prime is 20720502162121. The reversal of 20720502162111 is 11126120502702.

It is a happy number.

It is not a de Polignac number, because 20720502162111 - 2⁵ = 20720502162079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720502162121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29723016 + ... + 30412146.

It is an arithmetic number, because the mean of its divisors is an integer number (1727842746168).

Almost surely, 2^{20720502162111} is an apocalyptic number.

20720502162111 is a deficient number, since it is larger than the sum of its proper divisors (6924981776577).

20720502162111 is a wasteful number, since it uses less digits than its factorization.

20720502162111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695702.

The product of its (nonzero) digits is 3360, while the sum is 30.

Adding to 20720502162111 its reverse (11126120502702), we get a palindrome (31846622664813).

The spelling of 20720502162111 in words is "twenty trillion, seven hundred twenty billion, five hundred two million, one hundred sixty-two thousand, one hundred eleven".